Lamp.



'W r. im Annul.

LAMP.

A'PTIAJIUATION FILED MAB.; 16. 1'912.

1,043,791 Patented Nov.12,1912.

-QWM

UNITED sTATEs PATENT oEE1oE.-

WILLIM F. ANKLAM, .10F DETROIT, MICHIGAN', ASSIGNOR To C. M. HALL LAMP"CFOMPANY, OF DETROIT, MICHIGAN, A CORPORATION F MICHIGAN.

LAMP.

a c itizenof the' United. States of America,

' residing at Detroit, in the county of Wayne with respect to sleeve Fand State of Michigan, haveinvented certain neW and useful Improvementsin Lamps, of which the following is a specification, reference being hadtherein to the accompanying drawings y The invention relates to lamps ofthat type in which the illuminanti-.is placed at the focus of aparabolicfreflector and more particularlytolamps employing incandescentelectricbulbs.' With such constructions it is necessary -to .adjust theposition of the bulb with respect to theireflect'or .to securethe vproper focus, the lamp filaments varying in position.

The present invention relates to .a novel construction Y Afocus',.,wliicl'i broadly described consists of an adjustment kfor theparabolicv reflector the bulb andlamp lagasing which are in relativelyxed position, there- -by avoidingethe necessity of flexing electricalconnections to the bulb.

The invention furtherVA consists in the construction of means forguiding and adjusting the reflector and further in various details ofconstruction as hereinafter set forth.

In the draWings,-Fgure l is a central longitudinal section throughthelanip; Fig. 2 is a perspective View showing ortions of the lamp caseandreflector detac led; Fig. 3 is a section through the adjusting means.

A is the outer casing of arlamp which is preferably of parabolic formand B is the paralmlic reflector arranged within theouter case.

C is a guide post arranged at the center of the outer case and securedthereto, said post being hollow and forming a lamp D with which theelectric bulb E is engaged.' The outer surface of this post iscylindrical and forms a guide for engaging a flange or upon thereflector B permitting of' a relative longitudinal movement. The outerend of the reflect-or has aslidable engagementwith the case which asshown, is formed by providing an voutwardly extending disk flange G onthe reflector termniat` ing in a rearwardly extending cylindrical flangeI-I, the latter slidably engaging a cylindrical flange Lupon the diskflange J se cured to theouter case. 'l

y.Specification of Letters lPatent. Appneat'ion med Mare-h 16,

of mean-s for adjusting the j trical 1912. serial no. 684,218.

K is a screw-threaded stud extending parallel tothe axis of the case andpost C and secured at its rear end to the wall of the ease. This studpasses into engagement with the rotary nut L which is journaled in -abearing M secured to the flange'G of the reflector, the arrangementbeing such thatv by rotating the nut L the reflector is moved outward orinward'sliding upon the post C and flange I.

O is a thumb piece on the outer face of the flange G secured to the nutL and forminga means for rotating the same.

The lamp is provided with a suitable door with transparent panel and thelining of this door is arranged 'to abut against the flange J,preferablyhaving a-s'tepped engagement therewith and providing clearanceat the point opposite the thumb piece O.

In use', when the door of the lamp is closed the reflector can not beadjusted, which prevents unauthorized tampering with the same. Whenhowever, it is desired to adjust the reflector to properly focus thelamp, or to throw it out of focus` where a less intense light 1 srequired, this may be done by openlng the` doo-r and revolving thelthumb piece O.

The bulb E is engaged in the socket D and the latter is connections(no-t shown) and as the socket is always in fixed relation to the outercase, no ble connectors.

What I claim as my invention is: 4

l. In a lamp, the combination with a case, of a post extending axiallyWithin said ease and secured thereto, a lamp'socket within said post, aparabolic reflector sleeved upon said post, a bearing with which theouter end of' said reflector is slidably engaged, and means foradjusting said reflector.

2. In a. lamp, the combination with av ease. of' a post extendingaxially within said ease and fixed thereto, a parabolic reflectorsleeved upon said post, a cylindrical flange at the outer end of saidparabolic reflector. a corresponding cylindrical lflange upon said casewith which said reflector flangeis slidably engaged, and a screwadjustment to said case and extending axially in relation Patented Nov.12, 1912.

provided With any suitable elec-` provision is required for flexit v:1,043,7rl

to said reflector through an apertured bearsaid post, a parabolicrellector'sleeved upon i5 ing therein, a lamp, mounted on said postth'epost, coperat-ing bear'm portions upon within said reflector,avcylindrical flange at theparabolic retlectorand ne case permittheouter end of said reflector, a correspondtinga longitudinal movement ofthe re- -5 ing .cylindrical -l'ange onsaid case with' flee-tor inrelation to the case, and means at which said reflector flangev isslidably enthe front of .the rellector for adjusting the 20 .-gaged, a,stud secured to said case and ex` latter. tending parallel to theaxis-0f ysaid reflector In testimony whereof 'I affix my signaturethrough the flange 'threo and nutroi in presence ot two witnesses.

10 tativel secnrec to sai re ector ange anc i y T engagingsaid threadedstud. l WILLIAM F' Ab KL-AM 4. Ina lamp; the combination with a case, llVitnesses: of a post extending axially within said case i B. J. BELKNAP,

` and secured thereto, a lamp socket Within l KJAMES l). BARRY.

